Commit Graph

34 Commits

Author SHA1 Message Date
John Baldwin
ecad1d050c Rename __JCR_LIST__ to __JCR_END__ in crtend.c.
This is more consistent with the names used for .ctor and .dtor
symbols and better reflects __JCR_END__'s role.

Reviewed by:	andrew
Obtained from:	CheriBSD
MFC after:	2 weeks
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D27125
2020-11-10 19:04:54 +00:00
John Baldwin
0bfad43298 Include ABI note tag in shared libraries.
Split the ELF feature note into a separate file that is linked into
*crt1.o the same as crtbrand.S was before.  crtbrand.o is now linked
into crti.o on all platforms in addition to *crt1.o.

Reviewed by:	kib
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D25304
2020-07-16 21:58:43 +00:00
John Baldwin
99282790b7 Remove the sed hack for ABI tag notes.
The ELF notes compiled in C were placed in a section with the wrong type
(SHT_PROGBITS instead of SHT_NOTE).  Previously, sed was used on the
generated assembly to rewrite the section type.  Instead, write the notes
in assembly which permits setting the correct section type directly.

While here, move inline assembly entry points out of C and into assembly
for aarch64, arm, and riscv.

Reviewed by:	kib
Tested on:	amd64 (cirrus-ci), riscv64
Sponsored by:	DARPA
Differential Revision:	https://reviews.freebsd.org/D25211
2020-06-15 19:38:48 +00:00
Kyle Evans
20cb0deaa2 csu: Fix dynamiclib/init_test:jcr_test on !HAVE_CTORS archs
.jcr still needs a 0-entry added in crtend, even on !HAVE_CTORS archs, as
we're still getting .jcr sections added -- presumably due to the reference
in crtbegin. Without this terminal, the .jcr section (without data) overlaps
with the next section and register_classes in crtbegin will be examining the
wrong item.

PR:		241439
Reviewed by:	andrew
Differential Revision:	https://reviews.freebsd.org/D22132
2019-11-08 14:28:39 +00:00
Andrew Turner
e5c0fd4be6 Add the missing 0 at the end of the .jcr section.
Without this the dynamic library test was failing as it was calling
_Jv_RegisterClasses multiple times.
2018-11-24 18:23:53 +00:00
Ed Maste
b18e62b6da csu: use BSD-1-clause license on csu files
Copyright on these files is held by kib@ and/or the Foundation, and both
agree to this change.

Approved by:	kib
2018-11-20 21:04:20 +00:00
Ed Maste
bbce18b8d1 Add NT_FREEBSD_FEATURE_CTL ELF note to csu
This note will be used to allow binaries to opt out of, or in to,
upcoming vulnerability mitigation and other features.  It is not yet
connected but being added now to facilitate testing and ensure
compatibility with existing kernels and tools.

Reviewed by:	brooks, jhb, kib, markj
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17438
2018-11-20 20:59:49 +00:00
Andrew Turner
b7305f91e4 Run __cxa_finalize in shared objects in the destructor path.
When we have .dtors call them before .dtor handling, otherwise call from
a destructor.

PR:		233056
MFC with:	r339738
Sponsored by:	DARPA, AFRL
2018-11-13 15:28:27 +00:00
Ed Maste
57706376c6 Add __used to __CTOR_LIST__ and __DTOR_LIST__
Enabling BSD_CRTBEGIN on amd64 resulted in
error: unused variable '__CTOR_LIST__'.

__CTOR_LIST__ is indeed unused in crtbegin.c; it marks the beginning of
the .ctors array and is used in crtend.c.  Annotate __DTOR_LIST__ as
well for consistency.

Discussed with:	andrew
MFC with:	r339738
Sponsored by:	The FreeBSD Foundation
2018-10-31 14:19:58 +00:00
Andrew Turner
fb7128c25e Make the .ctors, .dtors, and .jcr markers as static. They shouldn't be
accessible from out of the files they are defined in.

MFC with:	r339738
Sponsored by:	DARPA, AFRL
2018-10-29 17:55:26 +00:00
Andrew Turner
fd8767bb69 Add __dso_handle to the BSD crtbegin. This is used to identify shared
objects.

MFC with:	r339738
Sponsored by:	DARPA, AFRL
2018-10-26 11:53:20 +00:00
Andrew Turner
31d62a73c2 Implement a BSD licensed crtbegin/crtend
These are needed for .ctors/.dtors and .jcr handling. The former needs
all the function pointers to be called in the correct order from the
.init/.fini section. The latter just needs to call a gcj specific function
if it exists with a pointer to the start of the .jcr section.

This is currently disabled until __dso_handle support is added.

Reviewed by:	emaste
MFC after:	1 month
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D17587
2018-10-25 17:39:41 +00:00
Konstantin Belousov
bdafb02fcb Process irelocs for statically linked binaries from crt1 on x86.
This makes statically linked binaries with ifuncs operational.

Reported and tested by:	mjg
Reviewed by:	emaste, markj
Sponsored by:	The FreeBSD Foundation
Approved by:	re (rgrimes)
Differential revision:	https://reviews.freebsd.org/D17363
2018-10-13 23:52:55 +00:00
Ed Maste
2284664ef9 crt: switch to standard note type definitions from elf_common.h
This makes it easier to grep the source tree for these notes, and
ensures that they will remain in sync.

Reviewed by:	kib
Approved by:	re (gjb)
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D17408
2018-10-04 17:35:32 +00:00
Pedro F. Giffuni
5e53a4f90f lib: further adoption of SPDX licensing ID tags.
Mainly focus on files that use BSD 2-Clause license, however the tool I
was using mis-identified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.
2017-11-26 02:00:33 +00:00
Andrew Turner
27b7672219 Add an elf note on ARM to store the MACHINE_ARCH an executable was built
for. This is useful for software needing to know which architecture a
binary is built for as arm and armv6 have slight differences meaning only
some binaries build for one will work as expected on the other. It is
expected pkgng will be able to make use of this to simplify the logic to
determine which package ABI to use.

Approved by:	re (kib)
2013-09-26 07:53:18 +00:00
Konstantin Belousov
d549ead6a9 Only assign the environ in the startup code when environ is NULL.
Preloaded library could have changed the environment, and
unconditional assingment to the environ undoes the customization.
The binaries needs to be recompiled to get the fix.

Move the common code to set up environ and __progname into the helper.
Note that ia64 possibly not fixed, due to it still using old csu.

Reported and tested by:	John Hein <jhein@symmetricom.com>
Reviewed by:	kan, scf
Approved by:	secteam (simon)
MFC after:	2 weeks
2013-01-07 17:58:27 +00:00
Konstantin Belousov
a22748dbd9 Stop calling _init/_fini methods from crt1 for dynamic binaries. Do
call preinit, init and fini arrays methods from crt1 for static binaries.

Mark new crt1 with FreeBSD-specific ELF note.

Move some common crt1 code into new MI file ignore_init.c, to reduce
duplication.  Also, conservatively adjust nearby sources for style.

Reviewed by:	kan
Tested by:	andrew (arm), flo (sparc64)
MFC after:	3 weeks
2012-03-11 20:04:09 +00:00
Konstantin Belousov
d1545c15cf Add a header with definitions useful for constructing ELF notes.
Reviewed by: kan
MFC after:   3 weeks
2012-03-11 19:56:58 +00:00
Dimitry Andric
9ef4e3afcb Apply a workaround for a binutils issue with the .note.ABI-tag section
generated from lib/csu/common/crtbrand.c (which ultimately ends up in
executables and shared libraries, via crt1.o, gcrt1.o or Scrt1.o).

For all arches except sparc, gcc emits the section directive for the
abitag struct in crtbrand.c with a PROGBITS type.  However, newer
versions of binutils (after 2.16.90) require the section to be of NOTE
type, to guarantee that the .note.ABI-tag section correctly ends up in
the first page of the final executable.

Unfortunately, there is no clean way to tell gcc to use another section
type, so crtbrand.c (or the C files that include it) must be compiled in
multiple steps:

- Compile the .c file to a .s file.
- Edit the .s file to change the 'progbits' type to 'note', for the section
  directive that defines the .note.ABI-tag section.
- Compile the .s file to an object file.

These steps are done in the invididual Makefiles for each applicable arch.

Reviewed by:	kib
2011-01-13 20:44:31 +00:00
Konstantin Belousov
11ddf4fd56 The __used (== __attribute__((__used)) ) silences the warning produced
by unreferenced symbol. Apply __used instead of rev. 1.5.

Requested by:	kan
2007-12-04 12:18:43 +00:00
Konstantin Belousov
fb76e092de Restore the branding of the ELF executables. The structure was optimized out.
MFC after:	3 days
2007-12-03 13:21:21 +00:00
Marius Strobl
bb4e1f9101 GC these crt{begin,end}.c, which are unused since the last FreeBSD platform
switched to those created from GCC's crtstuff.c 4 years ago.
2006-05-22 19:30:02 +00:00
Peter Wemm
3efeb2b693 Explicitly specify an alignment for abitag. Without it, gcc specifies a
section alignnment of 16 bytes for amd64 and this breaks file(1).
Before:
./cp: ELF 64-bit LSB executable, AMD x86-64, version 1 (FreeBSD), for \
  FreeBSD 127.7.9, statically linked, stripped
after:    ^^^^^^^
./ls: ELF 64-bit LSB executable, AMD x86-64, version 1 (FreeBSD), for \
  FreeBSD 5.0.1, dynamically linked (uses shared libs), stripped

The reason for this is that the NOTE sections are not contiguous
internally.  If the note section has an alignment of 16, then anything
that looks for the data is supposed to round up the payload start to
the next multiple of the alignment.  But FreeBSD/amd64 broke because the
structure is declared as a single structure, not a (header,payload) group,
where the payload had an explicit alignment roundup.

The alternative is to change things like file(1) to ignore the ELF payload
alignment rules for the PT_NOTE section only for FreeBSD.
2003-10-17 15:43:13 +00:00
David E. O'Brien
bbe4999bd1 Set abitag __unused. 2003-05-04 18:33:26 +00:00
David E. O'Brien
3222c45089 Fix the copyright dates. 2002-05-07 18:07:43 +00:00
David E. O'Brien
2040953a71 GC code that moved to crtbrand.c. 2002-01-28 19:02:34 +00:00
David E. O'Brien
9ac8182513 Feh, it helps to include a file other than yourself... wonder how
GCC cpp liked that.

Properly include the branding info.
2001-10-27 08:25:32 +00:00
David E. O'Brien
ae7c8a2bb8 * Bring back the guts of crt{i,n}.S. This allows C++ exceptions to work
when using the egcs and gcc-devel ports, along with GCC built from stock
public FSF sources.  With out this change, FreeBSD will be removed from
the list of systems GCC 3.0 must be evaluated on before release.  With
the effort some of us put into getting FreeBSD on this list, we should
not turn this effort into a waste, else we might not be worth fighting
for in the future.  (note that Alpha and IA-64 versions of crt{i,n}.S
are needed)

* Switch from our own crt{begin,in} to those created from GCC's crtstuff.c.
This will allow us to switch to DWARF2 exceptions in the future, along with
staying in sync with any future GCC requirements.

* Break out our ELF branding bits into a seperate file.  Currently this
is now included by our crt1.c files (since this functionality was part of
our native crtbegin.c).  Later crtbrand.o will be merged in the creation
of crti.o.
2000-10-28 21:26:48 +00:00
John Polstra
f6d15b87f8 This is step 1 in an effort to unify the start-up files for the
various architectures.  Now all the work is done in crtbegin.c.
It doesn't contain any assembly language code, so it should work
fine on all architectures.  (I have tested it on the i386 and the
alpha.) The old assembly language files crt[in].S are now empty
shells that generate no code or data.  They should not be removed
any time soon, because the various versions of gcc in src and ports
expect them to exist.

Next I will move crtbegin.c into a new common machine-independent
directory, and adjust the i386-elf Makefile to use that version.
After that I will adjust the alpha Makefile to use the common
version too.

Requested by:	obrien
2000-05-19 04:32:17 +00:00
Peter Wemm
7f3dea244c $Id$ -> $FreeBSD$ 1999-08-28 00:22:10 +00:00
John Polstra
0738f6e0c3 Reverse the order of processing object files within an executable or
shared library when invoking global constructors and destructors.
For constructors, the object files used to be processed from first
to last; now they're done from last to first.  (Destructors are done
in the opposite order, as required by the C++ standard.)  This makes
us consistent with standard gcc and egcs compilers.  It also
eliminates ordering differences between dynamic and static
executables.

Bump the value of __FreeBSD_version to 400002 to reflect this
change.
1999-03-13 01:35:44 +00:00
John Polstra
bb2b869188 Move the code for the ".init" and ".fini" sections outside of a
C function so the compiler won't try to emit line numbers for it
with "-g", breaking the build.  This has the nice side-effect of
making crtbegin.o and crtbeginS.o a little bit smaller.

Remove "-Wno-unused" from the Makefile.  Replace it with "__unused"
on particular function and variable declarations.
1999-03-12 17:33:28 +00:00
John Polstra
966a88d986 Import C startup files for ELF support.
Submitted by:	John Polstra <jdp@polstra.com>
1998-03-07 20:27:11 +00:00